thanks for the help everyone.
I guess my assumptions about guiding cameras being simple/cheap was wrong.
I did notice the prostar guigin cameras were selling for a little over $200 (PS-LPGUIDE-C or PS-LPGUIDE-M). If these are considered good for guiding then that might be a good start.
Is there any difference in performance using the monochrome vs colour one? Is one considered better for guiding?
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